sur·ly 
(sûrlē)
(sûrlē)adj. sur·li·er, sur·li·est
1. Sullenly ill-humored; gruff.
2. Threatening, as of weather conditions; ominous: surly clouds filled the sky.
3. Obsolete Arrogant; domineering.
[Middle English sirly, masterful, lordly, from sir, lord; see SIR.]
surli·ly adv.
surli·ness n.